A Compact Dual Circularly Polarized Microstrip Patch Array with Interlaced Sequentially Rotated Feed

Yizhu Shen, Shi Gang Zhou, Guan Long Huang, Tan Huat Chio

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

This communication presents a microstrip patch array, using sequentially rotated feed networks to achieve dual circular polarization in the same band. By interlacing the microstrip patches of adjacent 2 × 2 subarrays, the element spacing is minimized to avoid the challenging grating lobe issue. In this manner, the number of radiating elements is reduced from the conventional 4N to 2N + 2, where N is the number of 2 × 2 subarrays. The array is implemented on a two-layer substrate, with the upper layer hosting the microstrip patch array and the sequentially rotated networks, and the lower layer hosting the power dividers, sharing a common ground plane in the middle. To validate this novel configuration, a prototype is fabricated and measured. It achieves both |S11| < -10 dB and axial ratio < 3 dB bandwidth of 12.5% (4.95-5.61 GHz) for right-hand circular polarization and 14.7% (5.05-5.85 GHz) for left-hand circular polarization. The isolation between the orthogonal circularly polarized ports is about 12 dB in band.

Original languageEnglish
Article number7544457
Pages (from-to)4933-4936
Number of pages4
JournalIEEE Transactions on Antennas and Propagation
Volume64
Issue number11
DOIs
StatePublished - Nov 2016

Keywords

  • Dual circular polarization
  • interlaced subarrays
  • microstrip patch array
  • sequentially rotated feed

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